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US 10,502,134 B2Granted
Reduction of turbofan noise
AssigneeSafran Aircraft Engines
InventorsLaurent Louis Robert Baudoin, Georges Jean Xavier Riou
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AssigneeSafran Aircraft Engines
InventorsLaurent Louis Robert Baudoin, Georges Jean Xavier Riou
Estimating the term…
The invention relates to an aircraft turbofan type engine (1) comprising an air intake duct (2) having an inner face provided with an acoustic attenuation shroud (11) located upstream from a fan (3) of this engine (1). This acoustic attenuation shroud (11) comprises a regular alternation of first portions and second portions with different first and second thicknesses along the radial direction, the number of alternations being greater than twice the number of passing azimuth acoustic vibration modes occurring in the engine (1) without the acoustic attenuation shroud (11) operating under conditions corresponding to a landing phase and a take-off phase.
Turbofan type aircraft engine comprising a fan case provided with an acoustic attenuation shroud having regular alternation of first portions and second portions provided with different first and second thicknesses along a radial direction, the number of alternations being greater than twice the number of passing azimuth acoustic vibration modes occurring in an engine without the acoustic attenuation shroud and operating under conditions corresponding to a landing phase and a take-off phase, the acoustic attenuation shroud located in the engine, upstream from a fan of the engine.
Dependencies are inferred from the claim text.